[Smitty]

So the front crossmember in my coupe had been replaced with a 29 unit, bolted in with 3/8 bolts. Scribed the correct location on the frame then put a copper plate behind the 3/8 holes and welded them up with a mig. Next we re-drilled the holes with proper size rivet holes and replaced with Big Flats Rivets. A friend held a buck and we heated the rivet with ox-actelene torch. Once cherry red shot the rivet down with 4-x rivet gun, took 2 heating's to get it set tight. That was 12 years ago, has not loosened a bit and cant tell the cross-member had ever been replaced. Not difficult, just take your time and do it right.